Applevale Challenger. The Morgan Horse Magazine. Jan/Feb 1971

 https://www.allbreedpedigree.com/applevale+challenger

Sire of only 19, but these included:

 Saddleback Sealect, sire of 117 get, see his progeny listing for further info-- https://www.allbreedpedigree.com/index.php?

query_type=horse&h=SADDLEBACK+SEALECT&g=5&cellpadding=0&small_font=1&l= ;

Saddleback Sentinel, sire of many, and many for the Cosmos prefix 

https://www.allbreedpedigree.com/index.php?query_type=horse&h=SADDLEBACK+SENTINEL&g=5&cellpadding=0&small_font=1&l= ;

Saddleback Swingtime, dam of many Up-Hyre prefix Morgans who bred on

https://www.allbreedpedigree.com/index.php?query_type=horse&h=SADDLEBACK+SWINGTIME&g=5&cellpadding=0&small_font=1&l= ;

Saddleback Symphony, dam of many including Phantom of the Opera and Philharmonic, and others,

https://www.allbreedpedigree.com/index.php?query_type=horse&h=SADDLEBACK+SYMPHONY&g=5&cellpadding=0&small_font=1&l=